Transformer relief diaphragm



April 1929- 1.. H. HILL El AL 1;709,723

TRANSFORMER RELIEF DIAPHRAGM Filed Oct. 4, 1924 WITNESSES: INVENTORS 6 4a, Lewd/mm x M BY h/a/ferfli 00/717.

3% ATTORNEY Patented Apr. 16, 1929.

UNITED STATES 1,109,123 PATENT OFFICE.

LELAND n. HILL, or SWISSVALE, 1m) WALTER M. mum; on wuxmsnoae, mm snvnma, assrenons ro wnsrmenousn ELECTRIC a moracrunmo com. PANY, A coaronarron or rnnnsnvanm.

TRANSFORMER RELIEF DIAPHRAGM.

Application filed October 4, 1924. Serial No. 741,641.

Our invention relates to electrical translating devices andparticularly to devices for indicating the occurrence of excess1ve pressures therein.

One object of our invention is to provide an electrical translating device with means for indicating the occurrence of excessive pressures therein- Another object of our invention is to provide an indicating device that shall operate upon the rupture of a relief diaphragm.

A further object of our invention is to provide an electrical translating device that shall give both a visual and an audible 1ndication of the occurrence ofpressure therein sufiicient to rupture the relief diaphragm.

In electrical translating devices, such as transformers and circuit interru ters, it 1s customary practice to partially ll the casing with oil in such manner that a relief diaphragm placed in the upper part of the translating device is liable to rupture upon the occurrence of excessive pressures in the translating devices rather than at seams and joints of the electrical devices themselves.

In our co-pending application, Serial No. 608,773, filed Dec. 23, 1922, is shown and described a preferred disposition of such relief diaphragms in the cover of electrical translating devices. The present invention provides indicating means that shall operate upon the rupture of such dlaphragms.

In the accompanying drawings,

Figure 1 is a side-elevational view of an electrical translating device embodying our invention.

Fig. 2 is a fragmentary view, partially in elevation and partially in section, of the electrical translating device shown in Fig. 1. Fig. 3 is a fragmentary view, partially in elevation and partially in section, of the translating device shown in Fig. 1.

Fig. 4 is a sectional view of a detail of our invention taken along the section line IVIV in Fig. 2.

Our invention comprises, in general, an electrical translating device 1, such as a transformer or circuit interrupter, provided with a relief diaphragm 2 and a cover 3, together upon the rupture of the rellef dia hragm.

Referring to Fig. 3, the relief iaphragm 2 is secured in the cover member of the with an indicator 4 that operates translating device 1 below the cover member 3 that, 1 n turn, is yieldingly attached to the translatin device 1 by bolts and springs 5 in order t at 1t may be movable relatively to the diaphragm 2 and the translating deco-operates with the opening 7 in the cover member3. A coil spring 15 is attached to the support 12 at one end and, at the other end to a in 16 carried by the rod 9, thereby placing t e coil spring in tension when the 7 pin 14 is in opening 7. 1

Referr1ng to Fig; 4, the support 12 is provided with a pair of stationary contact members 17 that co-operate with a contact member 19 carried bythe pin 16 for completing an electrical circuit 21 comprising an audible alarm 22 and an indicating lamp 23.

Upon the assembly of the electrical translatmg device 1, the diaphragm 2 is mounted thereln and the cover member 3 placed there over .with the pin 14 registered in the opening 7. The rod 9 is thereby retained in its left hand position against the bias of the sprlng 15, and the'target 8 is retracted behind the edge of the translating device 1.

Upon the occurrence of excessifl pressure 1n the translating device 1, due to any cause whatsoever, such that the relief diaphragm 2 is ruptured, the cover member 3 is raised against the springs 5 during the escape of fluid under pressure. The upward move ment of the cover member 3 is sufiicient to release the pin 14 from the hole 7, whereupon the rod 9 moves to its dotted-line position in Fig. 2 and rojects the target 8 beyond the edge of t e translating device 1. At the same time, the movable contact member 19 engages the stationary contact members 17 and completes the electrical circuit23 to cause the audible signal 22 and the visual signal 23 to function.

In order to re-set the indicating device 4, it is necessary to lift the cover member 3 and move the pin 14 into registry with opening 7, after which the cover 3 is lowered.

This operation retracts the target 8 and.

places the spring 15 under tension for a subseq ent operation of the indicating device.

ur indicating devices are particularly us ful in connection with transformer banks where it is necessary to uickly ascertain which one of a number 0 transformers is at fault without rendering the entire number of transformers electrically inactive and making necessary an internal inspection of each.

It is to be understood that such changes may be made in the disposition of the several parts constituting our invention and structural details thereof as fall within the scope of the appended claims.

We claim as our invention:

1. The combination with a closed casing comprising a relief diaphragm that is adapted to be ruptured in case of excessive pressure in said casing, of a Visual indicating device operable upon the rupture of the dia- I phragm.

2. The combination with a closed casing comprisin a relief dia hragm and a cover member tlierefor that is movable upon the rupture of said diaphragm because of excessive pressure insaid casing, of an indicating device connected to said cover member and operable upon the rupture of the diaphragm.

3. The combination with a closed casing comprising a relief diaphragm and -a cover member therefor adapted to be actuated upon the rupture of said diaphragm, of means controlled by the cover member for indicating the rupture of the diaphragm.

4. The combination with a closed casing comprising a relief diaphragm and a movable cover member therefor, a spring-actuated indicator controlled b the cover member and released upon pre etermined movement thereof upon the rupture of the diaphragm.

5. The combination with a closed casing comprising a relief dia hragm and a cover member therefor that is movableupon the rupture of the diaphragm, of an indicator released by the cover member upon the occurrence of predetermined movement of the latter.

6. The combination with a closed casing comprising a relief diaphragm, and a loosely mounted cover member therefor, of a springactuated indicator coacting with said cover member and detachably retained thereby in a biased position.

7. The combination with a closed casing comprising a relief diaphragm, and a loosely mounted cover member therefor, of a springactuated indicator comprising a pin coacting with said cover member, movement of said cover member detaching said pin therefrom to permit movement of said indicator under the influence of its actuating spring.

8. The combination with a casing containing an insulating liquid medium for electrical apparatus generating heat during operation thereof, of controlled mechanism, and means comprising a rupturable diaphragm for effecting the actuation of said controlled mechanism, said means being responsive to the occurrence of predetermined pressure in said casing.

In testimony whereof, we have hereunto subscribed our names this first day of October, 1924.

LELAND H. HILL. WALTER M. DANN. 

